Wolven1992

I am a total noob so bare with me please. i just purchased an arduino micro and would like to use 15 digital pins as sensor I/O. The product page says that is has 20 digital I/O's but when i look at the pinouts it only lists pins 0-13 (assuming that i can use the TX and RX as digital pins 0 and 1). so what pins are the other digital pins? and can i define them like i would normally, like as in pin 14? or can i even define 15 digital I/O's on the Micro? any information helps. thanks!